I had surgery on my chest a few years back and could not use my chest at all for about 3 months...my muscle in my upper body atrophied and I lost about 30lbs! I went from benching 275 reps to 125lbs, dead lift 405 reps to 225 ect ect....I was so weak and skinny people who knew me from before didnt know wtf had happend to me.

I worked hard in the gym and took my time...it took a while! but with muscle memory I put the weight back on rather quick. Prob took me about a year and a half to build it all back to were I was before.